Explosion-Proof Loop-Powered Process and Level Indicator


The Tek-LCD 7800B is one of Tek-Trol’s most advanced and feature-packed explosion-proof, loop-powered indicators. The fact that this meter is loop-powered means that there is no need to run additional, costly power lines into a hazardous area. The Tek-LCD 7800B carries FM, CSA, ATEX, and IECEx approvals for use in hazardous areas. It features a dual-line display that can be easily scaled in the field for any 4-20 mA analog input. The display has a five digit upper display, a seven alpha-numeric character lower display, and is available with a twenty-segment bar graph for level applications. Two features that really make the TEK-LCD 7800B stand out are its wide viewing angle display and SafeTouch® through-glass buttons. These buttons allow the Tek-LCD 7800B to be programmed and operated through the glass, thus eliminating the need to remove the cover in a hazardous area.
  • 4-20 mA Input
  • Modern, Sleek and Practical Enclosure for Safe Areas
  • 5-Digit, 0.7″ (17.8 mm) Upper Display (0.6″ for -0L1 Models)
  • Optional Level Indicator Bar Graph
  • 7 Alphanumeric Character, 0.4″ (10.2 mm) Lower Display
  • SafeTouch® Through-Glass Button Programming
  • Password Protection
  • 32-Point , Square Root, or Exponential Linearization
  • Loop or External DC-Powered Backlight Standard
  • 3.0 V Drop (6.0 V with Backlight)
  • Explosion-Proof, IP68, NEMA 4X Enclosure
  • HART Protocol Transparent
  • Operates from -40 °C to 75 °C
DisplayFive digits (-9999 to 99999) 0.70″ (17.8 mm) high, 7-segment, automatic lead zero blanking;
Decimal PointUpper process display has up to four decimal places or none: d.dddd d.ddd, d.dd, d.d, or ddddd
Display Update RateAmbient > -25°C: 2 Updates/Second. Ambient < -25°C: 1 Update/5 Seconds
Externally Powered BacklightVoltage Range: 9-36 VDC
Display OrientationDisplay may be mounted at 90° increments up to 270° from default orientation
Over RangeDisplay flashes 99999
Under RangeDisplay flashes -9999
Programming MethodFour SafeTouch® through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
Noise FilterProgrammable – Lo, Med, Hi, or Off
RecalibrationRecalibration is recommended at least every 12 months.
Max./Min. DisplayMax/Min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
PasswordProgrammable password restricts modification of programmed settings
Advanced FunctionsLive input calibration, linearization, square root, or programmable exponent.
Alarm IndicationFlashing display plus HI/LO indicators
Non-Volatile MemoryAll programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Normal Mode Rejection64 dB at 50/60 Hz
Operating Temperature Range-40 °C to 75 °C
Storage Temperature Range-40 °C to 75 °C
Relative Humidity0 to 90% non-condensing
ConnectionsScrew terminals accept 12 to 22 AWG wire
EnclosureExplosion-proof die-cast aluminum with glass window, corrosion resistant epoxy coating
MountingMay be mounted directly to conduit. Two slotted flanges for wall mounting or NPS 1½” to 2½” or DN 40 to 65 mm pipe
Overall Dimensions5.65″ x 5.25″ x 4.86″ (W x H x D)
Weight5.00 lbs (80 oz, 2.27 kg)

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